[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.580597] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 17.470647] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.006481] random: sshd: uninitialized urandom read (32 bytes read) [ 18.750488] random: sshd: uninitialized urandom read (32 bytes read) [ 28.378484] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.41' (ECDSA) to the list of known hosts. [ 33.833972] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.918364] ------------[ cut here ]------------ [ 33.923155] WARNING: CPU: 0 PID: 3806 at lib/vsprintf.c:1941 set_precision+0x144/0x170 [ 33.931183] precision 1037366 too large[ 33.934955] Kernel panic - not syncing: panic_on_warn set ... [ 33.934955] [ 33.942316] CPU: 0 PID: 3806 Comm: syz-executor667 Not tainted 4.9.96-g320d53a #7 [ 33.949916] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.959260] ffff8801b59ef6e0 ffffffff81eb0b69 ffffffff83a484a0 00000000ffffffff [ 33.967241] 0000000000000000 0000000000000000 0000000000000795 ffff8801b59ef7a0 [ 33.975220] ffffffff8141f975 0000000041b58ab3 ffffffff841b8030 ffffffff8141f7b6 [ 33.983198] Call Trace: [ 33.985759] [] dump_stack+0xc1/0x128 [ 33.991103] [] panic+0x1bf/0x3bc [ 33.996094] [] ? add_taint.cold.6+0x16/0x16 [ 34.002034] [] ? __warn.cold.9+0xa6/0x17f [ 34.007800] [] ? set_precision+0x144/0x170 [ 34.013654] [] __warn.cold.9+0xc1/0x17f [ 34.019250] [] warn_slowpath_fmt+0xc2/0x100 [ 34.025191] [] ? __warn+0x50/0x50 [ 34.030263] [] ? security_key_permission+0x83/0xc0 [ 34.036820] [] ? format_decode+0x1b1/0x9e0 [ 34.042675] [] ? set_precision+0x170/0x170 [ 34.048530] [] set_precision+0x144/0x170 [ 34.054211] [] vsnprintf+0x31e/0x1840 [ 34.059646] [] ? pointer+0xb00/0xb00 [ 34.064983] [] ? RECLAIM_FS_verbose+0x10/0x10 [ 34.071095] [] ? mark_lock+0x7a3/0x1280 [ 34.076688] [] vscnprintf+0x2d/0x60 [ 34.081936] [] vprintk_emit+0xf4/0x790 [ 34.087441] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 34.094249] [] vprintk+0x28/0x30 [ 34.099236] [] vprintk_default+0x1d/0x30 [ 34.104925] [] printk+0xaf/0xd7 [ 34.109824] [] ? log_wakeup_reason.cold.1+0x13f/0x13f [ 34.116633] [] ? memchr+0x42/0x80 [ 34.121716] [] dns_resolver_preparse.cold.3+0x9d/0x23b [ 34.128613] [] ? dns_resolver_free_preparse+0x40/0x40 [ 34.135421] [] ? dns_resolver_free_preparse+0x40/0x40 [ 34.142240] [] key_create_or_update+0x35b/0xac0 [ 34.148540] [] ? key_type_lookup+0xd0/0xd0 [ 34.154394] [] ? lookup_user_key+0x10f/0xd10 [ 34.160428] [] ? lookup_user_key+0xa0b/0xd10 [ 34.166456] [] ? __check_object_size+0x248/0x38e [ 34.172829] [] SyS_add_key+0x1b4/0x390 [ 34.178335] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 34.185837] [] ? do_syscall_64+0x48/0x490 [ 34.191603] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 34.199113] [] do_syscall_64+0x1a6/0x490 [ 34.204795] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 34.212096] Dumping ftrace buffer: [ 34.215607] (ftrace buffer empty) [ 34.219289] Kernel Offset: disabled [ 34.222888] Rebooting in 86400 seconds..